Tower top defoamer

Abstract

The present invention provides a tower top defoaming device, which includes a defoaming body of a hollow cylindrical structure, the defoaming body includes a cooling section with a plurality of cooling ports on the circumferential wall and an inlet section and a discharge section respectively arranged at both ends of the cooling section through a variable diameter section, the pipe diameters of the inlet section and the discharge section are both larger than the pipe diameter of the cooling section, and an alkali liquid recovery device is arranged in the inlet section. The pipe variable diameter technology is used to realize a sudden change in pressure difference, so as to achieve the purpose of breaking the liquid alkali foam and releasing the tail gas entrained in the foam; by opening holes reasonably on the tower wall, cold air outside the tower is introduced by utilizing the pressure difference inside and outside the tower, the gas in the tower is cooled, the temperature is reduced, and the water vapor condenses to reduce the flow rate; the swirl plate defoaming technology is used to further defoam and defoam the untreated liquid alkali foam; finally, a set of alkali liquid recovery devices is designed to collect the droplets generated by the treatment, and then the droplets flow into the alkali liquid pool through a liquid guide pipe. Through the design, the tail gas is cooled and de-frigged, and defoaming and defoaming are carried out efficiently.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas treatment, in particular to a tower top defoaming device. Background Art

[0002] In the lead-acid battery recycling technology, the tail gas needs to be treated with alkaline desulfurization before being discharged into the atmosphere. However, since multiple lead recovery furnaces share a set of tail gas treatment systems, due to the factory's investment saving and insufficient design, the operating load elasticity of the existing demister is insufficient and cannot adapt to the production needs with large load changes, which results in high exhaust gas velocity and temperature, and a large amount of liquid alkali foam. The liquid alkali foam is discharged from the tower mouth with the tail gas and turns into small droplets and falls to the ground. The small droplets are also corrosive. If there are workers in the working environment below the tower mouth, it will have an immeasurable impact on the workers' personal safety and health. In addition, the small droplets falling on the surrounding equipment will also damage the equipment, thereby reducing the operating safety factor, which not only pollutes the environment and causes waste of resources, but also poses a high risk to the human body and equipment. Summary of the invention

[0003] In view of the above problems in the prior art, the present invention provides a tower top defoaming device, which solves the problem that the defoaming device in the prior art has insufficient processing efficiency, resulting in the discharge of high-speed and high-temperature tail gas containing a large amount of alkali liquid foam.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0005] A tower top defoaming device is provided, which comprises a defoaming body with a hollow cylindrical structure. The defoaming body comprises a cooling section with a plurality of cooling ports and an inlet section and a discharge section respectively arranged at both ends of the cooling section through a variable diameter section. The pipe diameters of the inlet section and the discharge section are both larger than the pipe diameter of the cooling section, and an alkali solution recovery device is arranged in the inlet section.

[0006] Furthermore, it also includes a plurality of cyclone demister plates arranged in the discharge section, the cyclone demister plates include an external connection end connected to the defoaming body and a central blind plate end connected to the external connection end through a plurality of cyclone plates, and there is a flow gap between two adjacent cyclone plates for the exhaust gas to pass through. The exhaust gas after being treated by the variable diameter section contains leaked liquid alkali foam, so the leaked liquid alkali foam is treated by the cyclone demister plate, and the cyclone separation principle is used to more thoroughly defoam and remove the liquid alkali foam, fully eliminate the liquid alkali foam entrained in the exhaust gas, and at the same time reduce the exhaust gas flow rate again.

[0007] Furthermore, in order to shorten the distance from the droplets settling to the wall of the main tower of the defoamer and prevent excessive pressure drop, the inclination angle of the swirl plate is 30° to 90°, the center blind plate end is a cylindrical structure, and the diameter of the center blind plate end is 1 / 2 of the diameter of the external connection end. Preferably, the swirl plate adopts an outward plate swirl plate.

[0008] Furthermore, in order to collect the separated alkali liquid and return the alkali liquid to the alkali liquid recovery device, a liquid accumulation gap is opened on the external connection end, and a plurality of reflux holes are opened in the liquid accumulation gap. The liquid accumulation gap and the inner wall of the discharge section form a liquid accumulation groove with a rectangular cross-section.

[0009] Furthermore, the number of cyclone demister plates is three, and the rotation directions of any two adjacent cyclone demister plates are opposite, two cyclone demister plates are close to the variable diameter section, and the third cyclone demister plate is close to the outlet of the discharge section. The three cyclone demister plates are arranged in the above manner to make the tail gas flow with alkali liquid to perform a spiral upward motion, forming a cyclone separation effect, so that the leaked liquid alkali foam is thrown to the pipe wall, which not only further achieves the purpose of breaking the liquid alkali foam, but also reduces the tail gas flow rate again to a certain extent.

[0010] Furthermore, in order to reduce the exhaust temperature as much as possible, the cross-section of the cooling port is circular, and the cooling ports are evenly distributed along the cooling circumference. The high exhaust gas velocity is caused by the large steam content in it. The cold air entering through the cooling port cools the exhaust gas, condenses the steam, reduces the volume flow, and thus reduces the gas velocity.

[0011] Furthermore, in order to facilitate the collection and rapid discharge of alkali liquid, the alkali liquid recovery device includes a flow member with a hollow cylindrical structure and an annular protrusion extending radially outward along the flow member, and a plurality of alkali liquid recovery holes are opened on the annular protrusion. The flow member, the annular protrusion and the inner wall of the entrance section form an alkali liquid recovery tank with a rectangular cross-section.

[0012] Furthermore, in order to prevent the exhaust gas flow from corroding the alkali solution recovery device, the material of the flow member and the annular protrusion is low alloy steel, and the flow member and the annular protrusion are integrally formed.

[0013] Furthermore, the axial length of the variable diameter section is 0.3m~0.8m.

[0014] Furthermore, the material of the defoaming body is low alloy steel, and the wall thickness of the defoaming body is 3mm~16mm.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. For the liquid alkali foam mixed in the tail gas, this scheme uses the pressure change caused by the sudden change of the diameter of the variable section between the entry section and the cooling section to make the difference of the pressure change greater than the surface additional pressure of the liquid alkali foam, thereby bursting the liquid alkali foam and releasing the untreated tail gas in the liquid alkali foam. By increasing the diameter of the variable section between the exhaust section and the cooling section, the cross-sectional area of ​​the pipeline is increased, and the tail gas flow rate is reduced.

[0017] 2. Aiming at the high temperature of exhaust gas, this scheme adopts air cooling technology. The exhaust gas flow rate in the cooling section is fast, so the air pressure in the cooling section is relatively low, and it will be lower than the air pressure outside the cooling section, thus forming a pressure difference. Through the cooling port on the cooling section, the pressure difference and air swirl are used to introduce cold air outside the cooling section to cool down the high-temperature exhaust gas in the cooling section.

[0018] 3. The separated alkali solution is collected through a liquid recovery device and the collected droplets are directed to an alkali solution pool.

[0019] 4. The present invention has simple structure, convenient maintenance, low manufacturing cost and high energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a cross-sectional view of the tower top defoaming device.

[0021] Figure 2 This is a schematic diagram of the tower top defoaming device.

[0022] Figure 3 Schematic diagram of the cyclone demister plate of the tower top defoamer device.

[0023] Figure 4 It is a partial schematic diagram of the cooperation between the cyclone demister plate and the demister body of the tower top demister device.

[0024] Figure 5 It is a partial schematic diagram of the coordination between the alkali solution recovery device and the defoaming body of the tower top defoaming device.

[0025] Among them, 1. defoaming body; 2. cooling section; 201, cooling port; 3. variable diameter section; 4. entrance section; 5. discharge section; 6. swirl demisting plate; 601, external connection end; 6011, liquid accumulation gap; 6012, reflux hole; 602, center blind plate end; 603, swirl sheet; 7. circulation parts; 8. annular protrusion; 801, alkali solution recovery hole. DETAILED DESCRIPTION

[0026] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0027] Example 1

[0028] like Figure 1~Figure 3As shown, the tower top defoaming device includes a defoaming main body 1 of a hollow cylindrical structure, the defoaming main body 1 includes a cooling section 2 with a plurality of cooling ports 201 on the circumferential surface and an entry section 4 and a discharge section 5 respectively arranged at both ends of the cooling section 2 by a reducing section 3, the pipe diameters of the entry section 4 and the discharge section 5 are both larger than the pipe diameter of the cooling section 2, and an alkali solution recovery device is arranged in the entry section 4. In the present embodiment, the axes of the cooling section 2, the reducing section 3, the entry section 4 and the discharge section 5 are all coincident, the material of the defoaming main body 1 is Q345R, and the wall thickness of the defoaming main body 1 is 10mm. The axial length of the reducing section 3 is 0.5m, the cross section of the cooling port 201 is circular, and the cooling ports 201 are evenly distributed on the circumferential surface along the cooling section 2. The amount of external cold air is determined according to the amount of water vapor content in the tail gas, thereby determining the number of cooling ports 201 and the aperture size of the cooling ports 201.

[0029] It also includes three circular cyclone defogger plates 6 arranged in the discharge section 5, the axis of the cyclone defogger plates 6 coincides with the axis of the discharge section 5, the number of the cyclone defogger plates 6 is three, and the rotation directions of any two adjacent cyclone defogger plates 6 are opposite, two cyclone defogger plates 6 are close to the variable diameter section 3, and the third cyclone defogger plate 6 is close to the outlet of the discharge section 5.

[0030] like Figure 4 As shown, the cyclone demister plate 6 includes an outer connection end 601 connected to the defoaming body 1 and a central blind plate end 602 connected to the outer connection end 601 through thirty cyclone plates 603, and there is a flow gap between two adjacent cyclone plates 603 for the exhaust gas to pass through. The inclination angle of the cyclone plates 603 is 70°, the central blind plate end 602 is a cylindrical structure, and the diameter of the central blind plate end 602 is 1 / 2 of the diameter of the outer connection end 601, and the width of the central blind plate end 602 is greater than the width of the cyclone plates 603. A liquid accumulation notch 6011 is opened on the outer connection end 601, and four reflux holes 6012 are opened in the liquid accumulation notch 6011. The liquid accumulation notch 6011 and the inner wall of the discharge section 5 form a liquid accumulation groove, the cross section of the liquid accumulation groove is rectangular, and the liquid accumulation groove is an annular groove.

[0031] like Figure 5 As shown, the alkali liquid recovery device includes a flow member 7 of a hollow cylindrical structure and an annular protrusion 8 extending radially outward from the flow member 7, and a plurality of alkali liquid recovery holes 801 are opened on the annular protrusion 8. The flow member 7, the annular protrusion 8 and the inner wall of the inlet section 4 form an alkali liquid recovery tank with a rectangular cross section. The flow member 7 and the annular protrusion 8 are made of low alloy steel, and the flow member 7 and the annular protrusion 8 are integrally formed.

[0032] Example 2

[0033] like Figure 1~Figure 3As shown, the tower top defoaming device comprises a defoaming body 1 of a hollow cylindrical structure, the defoaming body 1 comprises a cooling section 2 and an inlet section 4 and a discharge section 5 respectively arranged at both ends of the cooling section 2 through a reducing section 3, the pipe diameters of the inlet section 4 and the discharge section 5 are both larger than the pipe diameter of the cooling section 2, and an alkali solution recovery device is arranged in the inlet section 4. In this embodiment, the axes of the cooling section 2, the reducing section 3, the inlet section 4 and the discharge section 5 are all coincident, the material of the defoaming body 1 is Q345R, and the wall thickness of the defoaming body 1 is 10 mm. The axial length of the reducing section 3 is 0.5 m.

[0034] It also includes three circular cyclone defogger plates 6 arranged in the discharge section 5, the axis of the cyclone defogger plates 6 coincides with the axis of the discharge section 5, the number of the cyclone defogger plates 6 is three, and the rotation directions of any two adjacent cyclone defogger plates 6 are opposite, two cyclone defogger plates 6 are close to the variable diameter section 3, and the third cyclone defogger plate 6 is close to the outlet of the discharge section 5.

[0035] like Figure 4 As shown, the cyclone demister plate 6 includes an outer connection end 601 connected to the defoaming body 1 and a central blind plate end 602 connected to the outer connection end 601 through thirty cyclone plates 603, and there is a flow gap between two adjacent cyclone plates 603 for the exhaust gas to pass through. The inclination angle of the cyclone plates 603 is 70°, the central blind plate end 602 is a cylindrical structure, and the diameter of the central blind plate end 602 is 1 / 2 of the diameter of the outer connection end 601, and the width of the central blind plate end 602 is slightly larger than the width of the cyclone plates 603. A liquid accumulation notch 6011 is opened on the outer connection end 601, and four reflux holes 6012 are opened in the liquid accumulation notch 6011. The liquid accumulation notch 6011 and the inner wall of the discharge section 5 form a liquid accumulation groove, the cross section of the liquid accumulation groove is rectangular, and the liquid accumulation groove is an annular groove.

[0036] like Figure 5 As shown, the alkali liquid recovery device includes a flow member 7 of a hollow cylindrical structure and an annular protrusion 8 extending radially outward from the flow member 7, and a plurality of alkali liquid recovery holes 801 are opened on the annular protrusion 8. The flow member 7, the annular protrusion 8 and the inner wall of the inlet section 4 form an alkali liquid recovery groove with a rectangular cross section, and the annular recovery groove is an annular groove. The material of the flow member 7 and the annular protrusion 8 is low alloy steel, and the flow member 7 and the annular protrusion 8 are integrally formed.

[0037] In addition to air cooling to cool the exhaust gas, water cooling can also be used. A spray pipe and a high-pressure water pump are used to introduce a cold fluid other than the foam body 1, and the cold fluid cools the cooling section 2. In addition, in order to reasonably reduce the exhaust gas temperature, temperature measuring devices are set at the entrance of the entrance section 4 and the outlet of the discharge section 5. The temperature measuring device is connected to the controller. The controller uses a PLC single-chip microcomputer, and the temperature measuring device uses a temperature sensor. The amount of cold fluid required for cooling is determined by temperature measurement, and the amount of cold fluid used is controlled by the controller. At the same time, the temperature of the exhaust gas after treatment is measured, and the exhaust gas is discharged after passing the test.

[0038] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tower top defoamer, characterized in that: The defoamer main body (1) comprises a hollow cylindrical structure, the defoamer main body (1) comprising a cooling section (2) with a plurality of cooling ports (201) and an inlet section (4) and a discharge section (5) respectively arranged at both ends of the cooling section (2) via a diameter-changing section (3), the pipe diameters of the inlet section (4) and the discharge section (5) are both larger than the pipe diameter of the cooling section (2), and an alkali solution recovery device is arranged in the inlet section (4); It also includes a plurality of cyclone demister plates (6) arranged in the discharge section (5), the cyclone demister plates (6) including an external connection end (601) connected to the defoaming body (1) and a central blind plate end (602) connected to the external connection end (601) via a plurality of cyclone plates (603), and a flow gap for exhaust gas to pass through is provided between two adjacent cyclone plates (603); The inclination angle of the swirl plate (603) is 30° to 90°, the central blind plate end (602) is a cylindrical structure, and the diameter of the central blind plate end (602) is 1 / 2 of the diameter of the external connection end (601); The external connection end (601) is provided with a liquid accumulation gap (6011), and a plurality of reflux holes (6012) are provided in the liquid accumulation gap (6011); the liquid accumulation gap (6011) and the inner wall of the discharge section (5) form a liquid accumulation groove with a rectangular cross-section.

2. The tower top defoaming device according to claim 1, characterized in that: The number of the cyclone demister plates (6) is three, and the rotation directions of any two adjacent cyclone demister plates (6) are opposite, two cyclone demister plates (6) are close to the diameter-changing section (3), and the third cyclone demister plate (6) is close to the outlet of the discharge section (5).

3. The tower top defoaming device according to claim 1, characterized in that: The cross section of the cooling opening (201) is circular, and the cooling openings (201) are evenly distributed on the circumferential surface along the cooling section (2).

4. The tower top defoaming device according to claim 1, characterized in that: The alkali solution recovery device comprises a flow member (7) of a hollow cylindrical structure and an annular protrusion (8) extending radially outward from the flow member (7), wherein the annular protrusion (8) is provided with a plurality of alkali solution recovery holes (801), and the flow member (7), the annular protrusion (8) and the inner wall of the inlet section (4) form an alkali solution recovery tank with a rectangular cross section.

5. The tower top defoaming device according to claim 4, characterized in that: The material of the circulation member (7) and the annular protrusion (8) is low alloy steel, and the circulation member (7) and the annular protrusion (8) are integrally formed.

6. The tower top defoaming device according to claim 1, characterized in that: The axial length of the variable diameter section (3) is 0.3 m to 0.8 m.

7. The tower top defoaming device according to any one of claims 1 to 6, characterized in that: The material of the defoamer main body (1) is low alloy steel, and the wall thickness of the defoamer main body (1) is 3 mm to 16 mm.

Images